Natalia Maca. TITAN POLSKA Sp. z o.o Kraków, Miłkowskiego 3/801 Tel Fax

Transcription

1 Natalia Maca TITAN POLSKA Sp. z o.o Kraków, Miłkowskiego 3/801 Tel Fax biuro@titan.com.pl

2 Presentation plan General information Design problems Geotechnical conditions MS-8 building part of the project Summary

3 General information Situated on the site of former Katowice coal-mine The modern new construction located below the ground level (up to 16m in depth) Substantial renovation of the old postindustrial 19th and the early 20th century buildings including creating the new underground floor MS-79 MS-8 MS-15 The new construction

4 Design challenges Support of the deep excavation walls (permanent and temporary) Stabilization of the mass movement area Preservation of historic buildings located by the edge of the excavation Designing the geotechnical support for adaptation works in MS-8 Strengthening the foundation of old shaft hoisting tower MS-79 and MS-15 Additional constraints: highly tight schedule and logistical problems Neighbouring objects in zone I and II of excavation impact MS-79 MS-8 Adaptation works MS-15 Joint structure Joint structure Unification of subsoil rigidity Joint structure Excavation depth up to 16.5m Underground building walls

5 Geotechnical and hydrogeological conditions Quaternary formations (anthropogenic and glaciofluvial) and carboniferous (weathered mudstone and sandstone with carbon interbeddings) No contignous water level, seepage and subsurface water Tectonic disorders (faults and minor quasi-continous disturbances) Post-mine cavities, cracks, loosened zones, old stamps adopting of observational method of design I Embankment III Eluvial soils V Compact rock Carbon inserts Rock mass affected presumed excavation zone Caverns Mining stamps Fault

6 Building of the shaft hoisting machine MS-8 Reducing the influence of the excavation on the sensitive structure Supporting the existing structure for the adaptation including creating of a new underground floor and a tunnel below the construction Stabilization of the deep excavation directly next to the existing buildings Micropile technology suitable for the ground conditions The new building The new undergroun d floor The elevator shaft and the tunnel

7 Building of the shaft hoisting machine MS-8

8 Building ot the shaft hoisting machine MS-8

9 Building of the shaft hoisting machine MS-8 Underpinning of the walls with micropiles 73/53 and 73/56 L=15m to reduce the settlements Underpinning of the original walls with micropiles 73/53 L=15m and 52/26 L=9m (as filling micropiles) to enable excavation inside the building at one step Connected to the upper structure with concrete beam braced with prestressed tie rods

10 Building of the shaft hoisting machine MS-8

11 Building of the shaft hoisting machine MS-8 Installation of micropile as a temporary retaining wall of 9m depth trench for the elevator shaft and the tunnel Micropile wall used as a sacrificial scaffolding TITAN 103/78 micropiles L=10.5m

12 Building of the shaft hoisting machine MS-8 External excavation stabilized with DFF pile wall in conjunction with anchor piles: Excavation depth up to 13m Piles L=15m TITAN anchors length up to 13.5m, spacing each 2 or 4 piles

13 Building of the shaft hoisting machine MS-8

14 Building of the shaft hoisting machine MS-8 and the tower MS-79 Buliding of the clothing store MS-15

15 General view on the construction site

16 Multi-factor monitoring system Theoretical settlements of walls 6mm Measured 3mm Theoretical horizontal displacement 36mm Measured 7mm Theoretical settlements of walls 6mm Measured 3mm Theoretical horizontal displacement 45mm Measured 26mm

17 Summary The demanding project successfully completed Works lasted 12 months Self-drilling injection micropiles in total length of 1,400 running meters were used for underpinning the renovated historical buildings nearly 15,000 running meters of TITAN 30/11 and 40/16 soil nails were installed. Over the 9,000 m of self-drilling injection micropiles were used as the retaining walls and the stabilization system of anchored micropile barriers in the area of dynamically active rock mass. Over 15,000 m of soil nails installed Over 3,800 m of anchors for pile walls Close cooperation of the geotechnical engineers, the designer and the contractor was the key to the success.

18 THANK YOU FOR YOUR ATTENTION